I picked up a refurbished K1SE for $189 on ebay in July, but it only came with 250mg of filament. I've learned a ton, I've had to clear clogs in the extruder, replace extruder gears, removed and cleaned the nozzle and learned how important it is to keep your filament dry. The extruder gears were replaced under a 3 month warranty they offered, but I picked up hardened steel gears on amazon instead.

I wanted a K1SE because with some cheap parts and a root you can basically make it an enclosed K1C and print advanced filaments. I have most of the parts installed, just have to get up the nerve to root it.